How to tell if roof is galvalume?

I got a request from a school Districk want me to wash about six elementary schools roofs. They’re all the same material.

Whoops accidentally posted, Need to know if they are government or galvanized and how to tell. If they are galvalume should I even do them? I’m assuming they are. Here is one image I have plus a Google earth view.

Lastly, what would you charge roughly for this one school ?


A lot, probably going to need to be brushed - contact Pat Clark at Precision Pro Wash, he makes Gutter Butter and does a lot of this type work. Just send pic, may want to keep location private, he’s got franchises all over the place. If you’ve 6 of them it’s going to be a big ticket. Probably $10-15k each at least to do them right. He may can help you on pricing too.

Too late I found it in 5 mins (SRES)